1 /*
2  * Copyright (C) 2016 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 package com.android.tv.menu;
18 
19 import android.support.annotation.Nullable;
20 import com.android.tv.ChannelTuner;
21 import com.android.tv.TvOptionsManager;
22 import com.android.tv.TvOptionsManager.OptionChangedListener;
23 import com.android.tv.TvOptionsManager.OptionType;
24 import com.android.tv.data.api.Channel;
25 import com.android.tv.menu.MenuRowFactory.TvOptionsRow;
26 import com.android.tv.ui.TunableTvView;
27 import com.android.tv.ui.TunableTvView.OnScreenBlockingChangedListener;
28 
29 /**
30  * Update menu items when needed.
31  *
32  * <p>As the menu is updated when it shows up, this class handles only the dynamic updates.
33  */
34 public class MenuUpdater {
35     private final Menu mMenu;
36     // Can be null for testing.
37     @Nullable private final TunableTvView mTvView;
38     @Nullable private final TvOptionsManager mOptionsManager;
39     private ChannelTuner mChannelTuner;
40 
41     private final ChannelTuner.Listener mChannelTunerListener =
42             new ChannelTuner.Listener() {
43                 @Override
44                 public void onLoadFinished() {}
45 
46                 @Override
47                 public void onBrowsableChannelListChanged() {
48                     mMenu.update(ChannelsRow.ID);
49                 }
50 
51                 @Override
52                 public void onCurrentChannelUnavailable(Channel channel) {}
53 
54                 @Override
55                 public void onChannelChanged(Channel previousChannel, Channel currentChannel) {
56                     mMenu.update(ChannelsRow.ID);
57                 }
58             };
59     private final OptionChangedListener mOptionChangeListener =
60             new OptionChangedListener() {
61                 @Override
62                 public void onOptionChanged(@OptionType int optionType, String newString) {
63                     mMenu.update(TvOptionsRow.ID);
64                 }
65             };
66 
MenuUpdater(Menu menu, TunableTvView tvView, TvOptionsManager optionsManager)67     public MenuUpdater(Menu menu, TunableTvView tvView, TvOptionsManager optionsManager) {
68         mMenu = menu;
69         mTvView = tvView;
70         mOptionsManager = optionsManager;
71         if (mTvView != null) {
72             mTvView.setOnScreenBlockedListener(
73                     new OnScreenBlockingChangedListener() {
74                         @Override
75                         public void onScreenBlockingChanged(boolean blocked) {
76                             mMenu.update(PlayControlsRow.ID);
77                         }
78                     });
79         }
80         if (mOptionsManager != null) {
81             mOptionsManager.setOptionChangedListener(
82                     TvOptionsManager.OPTION_CLOSED_CAPTIONS, mOptionChangeListener);
83             mOptionsManager.setOptionChangedListener(
84                     TvOptionsManager.OPTION_DISPLAY_MODE, mOptionChangeListener);
85             mOptionsManager.setOptionChangedListener(
86                     TvOptionsManager.OPTION_MULTI_AUDIO, mOptionChangeListener);
87         }
88     }
89 
90     /**
91      * Sets the instance of {@link ChannelTuner}. Call this method when the channel tuner is ready.
92      */
setChannelTuner(ChannelTuner channelTuner)93     public void setChannelTuner(ChannelTuner channelTuner) {
94         if (mChannelTuner != null) {
95             mChannelTuner.removeListener(mChannelTunerListener);
96         }
97         mChannelTuner = channelTuner;
98         if (mChannelTuner != null) {
99             mChannelTuner.addListener(mChannelTunerListener);
100         }
101     }
102 
103     /** Called when the stream information changes. */
onStreamInfoChanged()104     public void onStreamInfoChanged() {
105         mMenu.update(TvOptionsRow.ID);
106     }
107 
108     /** Called at the end of the menu's lifetime. */
release()109     public void release() {
110         if (mChannelTuner != null) {
111             mChannelTuner.removeListener(mChannelTunerListener);
112         }
113         if (mTvView != null) {
114             mTvView.setOnScreenBlockedListener(null);
115         }
116         if (mOptionsManager != null) {
117             mOptionsManager.setOptionChangedListener(TvOptionsManager.OPTION_CLOSED_CAPTIONS, null);
118             mOptionsManager.setOptionChangedListener(TvOptionsManager.OPTION_DISPLAY_MODE, null);
119             mOptionsManager.setOptionChangedListener(TvOptionsManager.OPTION_MULTI_AUDIO, null);
120         }
121     }
122 }
123